Magento - Custom price calculation

I am setting up a magento store and need some customization when calculating prices. My store will sell printed items like business cards, postcards and brochures.

Right now I am creating simple products using the extension found at [url removed, login to view]

I need to program in an option that will allow me to multiply the calculated price by a percentage. I want to add a select box where the person can select the service they would like. For example:

Regular = 100% multiply price by 100% (so no change in price)

Rush = 135% multiple price by 135% ( so price x 1.35)

Super Rush = 150% multiply price by 150% ( so price x 1.5)

This select box can go as the very last option if needed.

Not all products will make use of this select box. I would like to use a custom attribute. Test for the existence of the attribute and if it exists then show the select box. Preferably I would like to be able to enter an array into the attribute field for the option text and value. something like:

28 freelancere byder i gennemsnit $308 på dette job

Hello, We read your project, we can do it. We are a web design, web development company. We are developing outsourcing market and we always try to continue widening the ArrowHiTech reputation on this market and we haveFlere

Hello
We are a group of experts on Magento store design, development, customization, migration, optimization, support and product development here and are extensively working on Magento for the last SIX years (sinceFlere

Hi,
I have read your post and understood your requirement.
I have good experience in handling Magento/Woocommerce/ VirtueMart/Joomla/ HTML5/CSS3/PHP/ Drupal/Yii framework/Javascript/MySQL/
Kindly go through Flere

Hi,
I'm a Magento specialist with expertise in all aspects of E-Commerce development, experience with every version of Magento.
I am also a Zend Certified PHP Engineer.
Please refer to my feedback for excellent Flere

Hi, I (Myself a senior PHP, ASP.NET programmer using C# and VB) have a team having experience of more than 10 years in developing web and mobile applications. I have a team of expert programmers who write robust and buFlere

Hi sir,
Thank you for giving opportunity for biding...
we have gone through your requirements and we can build your magento Custom price calculation module according to your exact requirements.
Please Before AwaFlere

[login to view URL] ® Portfolio HERE,
I have reviewed your project description and I am confident I can complete your Magento website with all the customization you want to have integrated in the back-endFlere

Hello Sir,
First of all, we would like to tell you how we will initialize the project with you.
We insist to follow these steps before you award the project to us:
- we(technical team) will review the job and asFlere

Dear Sir, We claim to get it done perfectly for you EXACTLY in the way you want it - Kindly give we a chance and we will prove myself - Ready to prove our words,
let's get it done right away and I mean RIGHT AWAY !! Flere

Greetings Employer,
We could easily able to develop your Extension similar to your needs, we are already expert in that and done with many similar customized Extensions, please check out some of our already develFlere

Hi,
Magento guru is here, i work and bid only in Magento within 4years. Please have a fair compare on reviews number, looking for long term work with Magento, I can start work immediately, daily report working progrFlere

My name is Ema and I can be your future project manager. We are CERTIFIED in Magento and Prestashop; we have strong knowledge in Wordpress, Joomla, expertise in HTML5 / Jquery / CSS3. As you can see I’m a PREMIUM MEMBEFlere

Dear Project Owner,
Hope you are doing great!!
First & foremost, Thanks for submitted this job :)
I am ready to start working on this project right away so please initiate the PMB so that we can discuss more on thFlere